Model positioning means for grading machines



May 3, 1938. FAUNCE MODEL POSITIONING MEANS FOR GRADI NG MACHINES 3Sheets-Sheet 1 Filed March 12, 1937 lnvenTor.

. Leroy L .Fc1uhce bymal W May 3, 1938. L. FAUNCE 2,116,108

MODEL POSITIONING MEANS FOR GRADING MACHINES Filed March 12, 1957 sSheets-Sheet 2- InvenTor. Leroy L. Founce May 3, 1938.

L. L. FAUNCE MODEL POSITIONING MEANS FOR GRADING MACHINES Filed March12, 1937 3 Sheets-Sheet 3 k lnvenror. Leroy L.F aunce bym AI'iys.

Patented May 3, 1938 PATENT oFFicE MODEL POSITIONING MEANS FOR GRAD- INGMACHINES Leroy L. Faunce, Dorchester, Mass. Application March 12 1937,Serial N0. 130,546

' 12 Claims.

This invention relates to improvements in model positioning meansoperable to duplicate the outline of a master model either in thesamesize or any size proportionally increased or decreased from that of themodel. In such duplicating machines a tracer, which is caused to followthe outline of the model, actuates, through suitable mechanism, ascriber in such manner as to duplicate the outline of the model eitherinan identical size or any proportionately larger or smaller size. Themechanism for enlarging or diminishing the size of the scribed outlineis of a pantograph type, or its equivalent, provided with suitableadjustments to enableit to produce is the desired size of outline. Theterm scriber is used herein to designate any form of marking or cuttingdevice for the outline which is produced by the action of a tracer whichis caused to follow the outline of a master model. I

In many instances, particularly in: grading patterns for shoes and thelike, it is desirableto modify certain proportions of the outlineproduced relatively to those of the model without modifying otherportions of the outline with respect to those of the model.

The object of the present invention is to provide a model positioningmeans for a machine of this type comprising means for supportingthemaster model in such position that by causing the tracer to follow apredetermined section of the outline of the model the outline producedby the scriber will be proportional touthat followed by the tracerand-having means for so adjusting the model angularly with relation'toits normal 35 position that when the tracer iscaused to follow anadjacent section of the outline of the model the scriber will be movedin a path'varying from that which it would follow if the model-were inits normal position, but will cause the outline of 40 the modifiedsection to merge into the outline produced when the model is in itsnormal position Without interrupting the continuity of the cut lines ofthe adjacent section.

A preferred embodiment of the invention isil- 5 lustrated in theaccompanying drawings 'as applied to a pattern grading machine forproducing patterns of the same and different sizes for portions ofshoes; The illustrations herein show the application of the invention tothepro- 50 duction of patterns for seamless Vamps of shoes in which thetoe portion and the quarter portions of the vamp are integral. In themanufacture of this type of shoe it is desirable that the heel portionof the quarter for different sizes: shall 55 be maintained atapproximately the same width.

When patterns of different sizes are made from a master model by usualgrading machines, the Width of the heel portion of the quarter isincreased or decreased for different sizes in proportion to the increaseor decrease in size of the toe portion of the vamp. In order, therefore,to produce the desired width of the heel portion of the quarter it isnecessary to vary the adjustments of the duplicating mechanism of thegrading machine during the grading operation which requires greataccuracy and skill. Furthermore, the result of adjustment of suchduplicating mechanism will not cause the outlines produced bylthe normaland adjusted positions of adjacent sections of the pattern to mergeproperly into a continuous outline. It has, therefore, been customarywhen larger sizes than that of the model are produced to trim off suchexcess material as may be necessary to produce the desired width of theheel portion of the vamp.

One of the objects of the present invention is to provide readilyoperable means for adjusting the angular position of the master modelfrom its normal position in such manner that a desired pattern outlinemay be produced therefrom by adding to'or decreasing the width ofdesired sections of the pattern from that which would normally beproduced by the duplicating mechanism.

In certain instances, as in the grading of patterns for shoes, it isdesirable to maintain cer- 3O tain sections of the pattern the same forall sizes of patterns produced by the grading machine while maintainingthe proper outline and width for other portions of the pattern. Anotherobjecto'f the invention is to provide means for ad- '35 justing themaster model to accomplish this purpose.

These and other objects and features of the invention will more fullyappear from the following description and the accompanying draw- 40 ingsand will be particularly pointed out in the claims.

"A preferred embodiment of the model positioning mechanism designedparticularly for use in a pattern grading machine for producing patternsforparts of shoes is illustrated in the accompanying drawings, in which,

Fig. 1 is a plan view of the model plate of the machine provided with arotatable adjustable table to which a master mode-l, which isillustrated in dotted lines, as a seamless Vamp for shoes, may besecured;

Fig. 2 is a front view of the construction illustrated in Fig. 1; l

Fig. 3 is an underneath plan view of the same. a portion of the modelplate being cut away;

Fig. 4 is a detail view, mainly in vertical section on lines 44 Fig. 3,illustrating the manner in which the rotatable table is supported, andshowing also the mechanism by which the table is clamped in any desiredposition;

Fig. 5 is a detail sectional view showing the manner in which the masterpattern is secured to the rotatable table;

Fig. 6 is a detail sectional view on lines 66 Fig. 1 showing a scaleseated in a recess in the model plate and also illustrated above it asupplementary scale adapted to be secured to the seated scale;

Fig. '7 is a diagrammatic view showing the master model in full lines innormal position and in dotted lines in adjusted positions for thepurpose of proportionately enlarging the major portion of a patternbefore diminishing the heel portion of the vamp of such enlargedpattern;

Fig. 8 is a diagrammatic view showing in full lines the enlarged patternproduced by tracing the model in normal and adjusted positionsillustrated in Fig. '1 showing in dotted lines the outline of the mastermodel and in dot and dash lines the margin of the areas reduced byadjustment of the master model; 7

Fig. 9 is a diagrammatic view showing in full lines the model in normalposition and in dotted lines. one of the two adjustments of the modelrequired to enlarge the throat of the pattern produced by the scrlberwhen the tracer is caused to follow the pattern in normal and inadjusted positions; and,

Fig. 10 is a diagrammatic illustration in full lines of the patternproduced by the scriber when the tracer is caused to follow the outlineof the model partially in normal and partially in adjusted position, andillustrating in dotted lines the outline of the model and in dot anddash lines the margins of the areas reduced by adjustment of the mastermodel. 7

In the construction illustrated the model plate I is a rectangualr,preferably flat square steel plate, adapted to be set into and clampedin any suitable manner in the usual bed plate of a pattern gradingmachine of any well known type. The model plate I is provided with acircular opening 2 in which is mounted a flat rotatable table 3 thesurface of which is preferably flush with the upper surface of the modelplate The table 3 is provided with a plurality of slots 4 extendingparallel to the front of the machine and which may register with likeslots 5 in the model plate and also with slots 6 extending at rightangles to the slots 4 which in turn may register with like slots 1 inthe model plate. The table may also be provided with additional slots 8parallel to the slots 6 which in turn may register with slots 9 in themodel plate. All of these slots are undercut as illustrated in Fig. 5 toreceive and form guideways for the square heads of bolts l0 by means. ofwhich the master model M usually a metal plate having the desiredoutline, may be clamped by nuts l2. suitable spacing means l3 beinginterposed between the model M and the surface of the rotatable table 3.Each of the slots above described is provided with an enlargedpreferably square end portion |4 through which the heads ID of the boltsmay be introduced and slid into the undercut slot.

The table 3 is fixedly secured, preferably by screw threaded connectionl5 to the reduced end 1 portion of a shaft l6 having upper and lowertapered journals l1 and I8 which are mounted respectively incomplementary tapered bearings I9 and 2|] in transverse members 2| and22 of a suitable frame secured to and depending from the lower side ofthe model plate I. The transverse members 2| and 22 desirably are formedintegral with vertical side frames 23 and 24 having flanged upper endswhich are connected by suitable machine screws or bolts 25 to the underface of the model plate I. The vertical members 23 and 24 of the framehave secured to their lower ends below the transverse plate 22horizontally extending supplemental frame members 26 and 21 the endportions 28 and 29 thereof being parallel to the inner faces of theframe members 2| and 22 and firmly clamped thereon by pairs of bolts 39and 3|. The members 25 and 26 converge toward each other and are unitedby a preferably integral boss 32.

The supplemental frame provides means for supporting mechanism forrotatably adjusting the table 3 and also for supporting lockingmechanism for holding the tablefixedly in any position of adjustment.

The mechanism for rotatably adjusting the table comprises a toothedsector 34 having an arm 35 provided with a boss 36 which is fixedlysecured to the reduced lower end 31 of the shaft 5. The toothed sector34 engages a worm 38 upon a shaft 39 which is journaled in suitablebearings in the boss 32 of the supplemental frame and in a suitablebearing in a boss 40 which is secured to or formed integral with theportion 29 of the supplemental frame.

The shaft 39 has fixedly secured to its end.

which projects beyond the boss 32, a knurled hand wheel 4| whichdesirably also is provided with a handle 42 to enable the shaft to berotated rapidly if desired, while the knurled head 4| enables theoperator to rotate the shaft slowly for the purpose of accuratelyadjusting the position of the table. Suitable stops desirably areprovided for limiting the extent of rotatable adjustment of the table ineither direction. As illustrated herein these stops comprise L-shapedplates 43 and 44 which are bolted to the under side of the transversemember 22 and are provided with downwardly extending flanges 45 havingadjustable screws 46 mounted therein in such position that the ends ofthe screws may be adjustably positioned to engage and limit the movementof the sector arm 35.

Means are provided for indicating the extent of rotary adjustment of thetable 3 in order that the'o-perator may accurately adjust the positionof the model relatively to its normal position to modify the outline ofthe pattern in the manner above described. In the preferred constructionillustrated a toothed sector 41, concentric with the axis of the shaftI6, is secured to the under face of the table 3 by suitable machinescrews 48 which extend through radial slots in the sector 41. In orderto provide for properly positioning the sector 41 concentric with'theperiphery of the table 3, adjusting screws 49 and 59 are mountedrespectively in brackets 5| and 52 with their ends engaging the innerface of the sector 41. Obviously, by loosening the screws 48 theadjusting screws 49 and 50 may be actuated to position the sector 41accurately and the screws 48 then set up to hold the sector in itsproper position.

The teeth of the sector 41 engage the teeth of a pinion 53 which ismounted upon a stud shaft 54 anchored in the model plate I. The pinion53 has secured to its lower face an index arm 55 provided with an index56 which extends upwardly through a slot in the model plate intocooperation with a suitable scale 51 which is carried by the upper sideof the bed plate in such position that it can be readily observed by theoperator. j I

Desirably means are provided for enabling different scales to be readilyassembled upon the model plate. In the preferred constructionillustrated the model plate is provided with an arcuate recess 58.into'which scales 5'| corresponding in outline to the outline of therecess may be placed. For convenience: in making different adjustmentsinthe production of different portions of the: pattern a readily removablesupplemental scale 51a: may be superimposed upon the scale 51.

In order to secure the supplemental scale 51a: in place the scale 51 maybe'provided with holes 58 adapted to receive complementary pins 60projecting; downwardly from the scale 51m. The scale 51. desirably isprovided with an arcuate slot through which the index 56 extends incooperative relation to'the graduations of the posi tioned scale. Byreason of this arrangement suitable adjustments of the rotatable tablemay be made to enable the outlines of portions of the patternito bemodified from the outline which would :be produced from-the patternwithout adjustment and which'will cause the outlines of the modifiedportions properly to merge with those produced before the model isangularly adjusted.

The scale plates are provided with scales the central graduation ofwhich indicates the position in which the longitudinal axis of the modelcoincides with a diametrical line 6| on the table and plate which 'is inalinement with one of the straight line movements of one of thecarriages of the pantograph or duplicating mechanism. Symmetricalgraduations of the scale extend laterally from the central graduationtoenable the table to be rotatedin opposite directions equal amounts toprovide for modifications of right and left symmetrical sections of apattern.

Suitable means are provided for locking the rotatable table in anyadjusted position. In the particular construction illustrated herein abar 62, which in effectis a lever, is secured by a bolt 63 ;tothe underside of the supplemental frame member 21 and is provided at its:opposite end with a boss. 64 through which the screw threaded end 65 vofthe reduced end portion 37 of the shaft 26 extends. A nut 66 isadjustably mounted upon the screw threaded end 65 of the shaft and isheld in adjusted position by a suitable lock 66w. A bell crank lever 68is pivotally mounted upon the stud 61 projecting from the centralportion of the bar 62 and the outer end of the lever 68 is provided withan offset handle portion 59 positioned to be readily grasped by theoperator. The downward movement of the lever 68 desirably is limited bya strap 18 which is fixedly secured at its upper end to the bar 62 andat its l lower end has a U-shaped offset portion ll proa plate 18 whichis fixedly secured to the under face of the table 3 and extends beyondthe periphery thereof beneath the under face of the model plate I.

The connection between the bell crank lever 68and the link 13 produces atoggle which, when the lever 68 is swung to bring the axes of the pivots61 of the bell crank lever into alinement with the pivots which connectthe end of the bell crank lever to the link and the link to the lever M,swings the lever 14 upwardly and causes the cam face 11 of the lever 14firmly to clamp the plate 18 against the under face of the model plate,and when the lever is swung downwardly to the position illustrated indotted lines in Fig. 4 will relieve the clamping action of the lever 14upon the plate 28. r

By reason of the fact that the fulcrum 61 of the lever 68 is rigid withthe bar 62, the straightening movement of the toggle forces the bar 62downwardly from the position indicated in dotted lines in Fig. 4 to theposition illustrated in full lines, so that its connection to thereduced portion 65 of the shaft l6 pulls the shaft I6 downwardly therebyforcing the conical journal I! and H3 firmly into engagement with thecomplementary bearings I9 and 28 for the shaft, thereby binding theshaft in such manner as also to lock the table against rotation.

The following description of the grading of seamless vamps for shoes istypical of the operation of the machine and for clarity of descriptionrelative outlines of the master model are illustrated in full lines innormal position and in dotted lines in adjusted position in the righthand sections of Figs. '7 and 8, while the outline of the desiredpattern produced by the adjusted'model is illustrated in full lines inthe left hand sections of said figures with the dot and dash linesillustrating the outline which would have been produced from the modelwithout the adjustment.

Certain shoe manufacturers desire to maintain the same throat openingfor all sizes of seamless vamp patterns in order that the same die forornamental pinking of the edges of the throat, or the production ofornamental lines of perforations inthe vamp may be employed fordifferent sizes of shoes, thereby to avoid the necessity of purchasingdifferent dies for each size.

The operation of the invention to produce this result is illustrated inFigs. 7 and 8 in which the pattern is illustrated in Fig. 7 in itsnormal position in full lines, and in its adjusted position in dottedlines, it being understood that the pattern is secured to the table withits longitudinal axis 19 in axial alinement with the axial line 6| ofthe machine, the center 88 of the model preferably being superimposeddirectly in alinement with theaxis of the shaft |6 which corresponds tothe center of pantographic movement of the grading mechanism of themachine. The duplicating mechanism is so set as to produce a patern ofthe same size and shape as that of the model. The tracer of the gradingmechanism is then caused to follow the upper end wall 8| of the throatof the model and the sides 82 and 83 for any size pattern which is to begraded. The scriber of the grading machine will then outline or cut athroat having an upper portion 8|, sides 82 and 83 identical with thatof the model for any size of vamp.

The mechanism of the grading machine will i larger size is to be cut, asillustrated in Fig; 8 in full lines, the grading mechanism of themachine is set to produce such larger size pattern and the tracer of themachine is caused to follow the outline of the pattern from a point 84around the toe portion to a point 85 somewhat below the transverse linewhich would pass through the ball portion of the 'vamp. -The model isthen adjusted by rotating the table in a proper direction to such pointas indicated upon the scale 58 as will designate the amount to betrimmed from the outer edge of the pattern to produce the desired widthof the quarter or heel portion of the vamp. The tracer will then becaused to follow the line 86 of the model, thereby causing the scriberto outline the pattern along the full line 81, thereby reducing thewidth of the quarter or heel portion of the vamp from the positionillustrated by the dot and dash line 88 which would have been followedif the tracer had followed the outline B6 of the pattern in full linepositionillustrated in Fig. 7. When the line 81 is produced by thescriber it will merge into the outline at 84 without interrupting thecontinuity of the outline of the adjacent portions of the pattern. Ihescriber is then caused to follow the end 89 of the model thereby causingthe scriber to outline or cut the heel line 90 of the pattern.

By similar adjustment in the opposite direction an equal amount from thecenter line 6| as indicated by the scale graduations, the other-side ofthe pattern may be similarly graded to pro' duce the outline 9| for thequarter portion of the vamp and the heel line 92. By proper rotativeadjustments, therefore, of the table, as indicated by a suitablygraduated scale, the same width of the heel portion of the quarter maybe maintained for all sizes of vamps. It will, however, be obvious thatany width of the heel portion. of the vamp may be graded betweenthat-which would be produced from the master model without adjustment ofthe model and that produced by suitable adjustment of the modelaccording to the graduations of the scale.

In other instances it is desirable to modify the outline of the throatportion from that of the model by producing a wider or narrowerseparation of the edges of the quarters toward and at the heel part ofthe pattern. The manner in 661 which a wider throat opening is producedin a larger size than the model is illustrated in Figs. 9 and 10 of thedrawings in which the normal position of the model is illustrated inFig. 9 in full lines and one adjusted position in dotted lines.

In grading such larger pattern the scriber is first caused to follow theupper or wider end of the throat from the point 93 to 94 with thegrading machine set on the model size. The scriber will then produce anexact duplicate from the points 93 to 94 upon the pattern. The model isthen adjusted to the dotted line position shown in Fig. 9 and the tracercaused to follow the dotted line 95, thereby causing the scriber tooutline or cut the pattern along the line 96.

The model may then be adjusted in the opposite direction in like manneraccording to the scale and the tracer caused to follow the oppositeinner edge of the model, thereby causing the scriber to produce theoutline or cut on the line 91 shown in Fig. 10.

The grading mechanism is then changed to produce the desired size ofpattern. The tracer is then, caused to follow the toe portion of themodel from the point 98 to the point 99 with the model set in its normalposition in the manner above described. The model may then be adjustedangularly to produce the desired width of the heel portion of the vampin the manner described with reference to Figs. '7 and 8.

While the mode of operation of the invention has been described withreference to reducing or trimming certain portions of a pattern for aseamless vamp, it will be understood that like variations from a modelcan be made upon any sort of. a pattern, and further that by reversingthe adjustments of the pattern and the grading mechanism portions may beadded to desired sections of a pattern.

Although the invention has been particularly described herein withreference to means for positioning a model of a duplicating machine, thesame result may be obtained by providing a'rotatable support for thepattern blank with similar means for rotatably adjusting" the supportabout a fixed center of the pantograph mechanism complementary to thefixed center of the model as will be readily understood by those skilledin the art.

It will, therefore, be understood that the invention is adapted togeneral use in duplicating machines in which the pattern or design beingproduced is to be modified from the outline which would normally beproduced from the pattern.

7 Having thus described the invention, what is claimed as new, anddesired to be secured by Letters Patent, is:

1. Model positioning means for a machine of the pantograph type forproportionately duplicating the outline of a master model comprisingmeans for supporting a master model in such normal position that bycausing the tracer of the pantograph mechanism to follow a predeterminedsection of the outline of the model the scriber of the pantographmechanism will outline a pattern sect-ion proportional to said sectionof the model, and means for adjusting the model angularly with relationto said normal position after a predetermined section of the model hasbeen traced to cause the tracer when following an adjacent section ofthe outline of said model to move the scriber in a path which will varythe area of. the pattern from that which would be produced if the modelwere traced in its normal position, and which path will merge with theoutline produced when the model is in its normal position withoutinterrupting the continuity of the outline of said adjacent sections.

2. Model positioning means for a pattern grading machine of thepantograph type comprising a rotatable table having means for securing amodel thereto in longitudinal axial coincidence with a diameter of saidtable, means for rotatably adjusting said table normally to positionsaid diameter in parallelism with the straight line bodily movement ofone of the carriages of the grading machineso that when the tracer ofthe grading machine is caused to follow a predetermined section of theoutline of the model the scriber of the grading machine will outline apattern section proportional to said section of the model, and means forrotatably adjusting said table relatively to its normal position aftersaid predetermined section of the model has been traced to cause thetracer when following an adjacent section of the outline of said modelto move the scriber in a path which will vary the dimensions of anadjacent section of the pattern without interrupting the continuity ofthe outline of. said adjacent sections.

:3. Model positioning means for a pattern grading machine of thepantograph type comprising a rotatable table having means for securing amodel thereto in longitudinalaxial coincidence with the diameter of saidtab-1e, means for rotatably adjusting said table normally to positionsaid diameter in parallelism with the straight line bodily movement ofone ofthe carriages of the grading machine so that when the tracer ofthe grading machine is caused to follow a predetermined sectionoi theoutline of the model the scriber of the grading machine will outline apattern section proportional to said section of the model, means forrotatably adjusting said table relatively to its normal position aftersaid predetermined section of the modelhas been traced tocause saidtracer when following an adjacent section of the outline of said modelto move the scriber in a path which will vary the dimensions of anadjacent section of thepattern without interrupting the continuity ofthe outline of said adjacent section, and a cooperating index and scaleoperable by the table-adjusting means to indicate the amount ofadjustment of. the model from normal position required to produce apattern having predetermined variations from that which would beproduced by tracing the normally positioned model.

4. Model positioning means for a pattern grading machine comprising aflat plate having a circular aperture therein, a circular flat tablerotatably mounted in said aperture having means for securing the modelthereto in longitudinal axial coincidence with the diameter of saidtable, means for rotatably adjusting said table normally to positionsaid diameter in parallelism with the straight line bodily movement ofone of the carriages of the grading machine so that when the tracer ofthe grading machine is caused to follow a predetermined section of theoutline of. said model the scriber of the grading machine will outline apattern section proportional to said section of the model, means for sorotatably adjusting the table relatively to its normal position thatwhen the tracer is caused to follow an adjacent section of the outlineof said model the scriber will modify the outline of the pattern withoutinterrupting the continuity of the outline of said adjacent section, anarcuate scale mounted on said plate, and an index positioned tocooperate with said scale movable by said rotatable table in proportionto the graduation upon said scale.

5. Model positioning means for a pattern grading machine comprising afiat plate having a circular aperture therein, a circular fiat tablerotatably mounted in said aperture having means for securing the modelthereto in longitudinal axial coincidence with the diameter of saidtable, means for rotatably adjusting said table normally to positionsaid diameter in parallelism with the straight line bodily movement ofone of the carriages of the grading machine so that when the tracer ofthe grading machine is caused to follow a predetermined section of theoutline of said model the scriber of the grading machine will outline apattern section proportional to said section of the model, means for sorotatably adjusting the table relatively to its normal position thatwhen the tracer is caused to follow an adjacent section of the outlineof said model the scriber will modify the outline of the pattern withoutinterrupting the continuity of the outline of said adjacent section, anarcuate scale mounted on said plate, an index pivotally mounted on saidplate, and intermeshing gears connected respectively to said index andto said table operable to transmit to said index a movement proportionalto the rotation of said table.

6. Model positioning means for a pattern grading machine comprising arotatable table having means for securing a model thereto inlongitudinal axial coincidence with the diameter of said table, meansfor rotatably adjusting said table normally to position said diameter inparallelism with a straight line bodily movement of one of the carriagesof the grading machine so that when the tracer of the grading machine iscaused to follow a predetermined section of the outline of the model thescriber of the grading machine will outline a pattern sectionproportional to said section of the model, means for so rotatablyadjusting said table relatively to its normal position that when thetracer is caused to follow an adjacent section of the outline of saidmodel the scriber will modify the outline of the pattern withoutinterrupting the continuity of the outline of said adjacent section, andmeans operable fixedly to clamp said table in normal or adjustedpositions.

'7. Model positioning means for a pattern grading machine comprising aflat plate having a circular opening therein, a frame mounted upon anddepending from said plate having a shaft in axial alinement with thecenter of said opening, a fiat circular table secured to said shaftsubstantially fitting the opening in said plate, means for securing amaster model to said table with its longitudinal axis in parallelismwith a diameter of said table, means for accurately ad justing saidtable normally to position said diameter in parallelism with a straightline bodily movement of one of the carriages of the grading machine orin angular relation thereto, a scale carried by said table, an indexmounted on said table in cooperative relation to said scale, and meansfor transmitting the rotatable movement of said table to said index in apredetermined multiplied ratio.

8. Model positioning means for a pattern grading machine comprising aflat plate having a circular opening therein, a frame mounted upon anddepending from said plate having a shaft in axial alinement with thecenter of said opening, a fiat circular table secured to said shaftsubstantially fitting the opening in said plate, means for securing amaster model to said table with its longitudinal axis in parallelismwith a diameter of said table, means for accurately adjusting said tablenormally to position said diameter in parallelism with a straight linebodily movement of one of the carriages of the grading machine or inangular relation thereto, comprising a worm gear sector fixedly securedto said shaft, and a manually operable shaft mounted in said framehaving a Worm engaging said sector and having a wheel adapted to beconveniently grasped by the hand.

9. Model positioning means for a pattern grading machine comprising aflat plate having a circular opening therein, a frame mounted upon anddepending from said plate having tapered hearings in axial alinementwith the center of said opening, a shaft having complementary taperedsections mounted in said bearings, a fiat circular table secured to saidshaft substantially fitting the opening in said plate, means forsecuring a master model to said table, means for rotatably adjustingsaid table, and means for moving said shaft axially in its bearing toclamp said table in any adjusted position.

10. Model positioning means for a pattern grading machine comprising afiat plate having a circular opening therein, a frame mounted upon anddepending from said plate having tapered bearings in axial alinementwith the center of said opening, a shaft having complementary taperedsections mounted in said bearings, a flat circular table secured to saidshaft substantially fitting the opening in said plate, means forsecuring a master model to said table, means for rotatably adjustingsaid table, means for looking said table in adjusted positionscomprising means for clamping said table to said plate, and means forsimultaneously moving the shaft axially to force the tapered sections ofthe shaftinto their respective bearings.

11. Model positioning means for a pattern grading machine comprising afiat plate having a circular opening therein, a frame mounted upon anddepending from said plate having tapered hearings in axial alinementwith the center of said opening, a shaft having complementary taperedsections mounted in said bearings, a flat circular table secured to saidshaft substantially fitting the opening in said plate, means forsecuring a master model to said table, means for rotatably adjustingsaid table, means for locking said table in adjusted positionscomprising an extension underlying said plate, a lever pivotally mountedupon said plate having means to engage said extension, a lever pivotallymount ed upon said frame engaging the lower end of said shaft, andmanually operable toggle mechanism operable simultaneously to cause saidlever to clamp said table extension upon the plate and simultaneouslytodraw said shaft axially thereby to force the tapered sections of theshaft firmly into their respective bearings.

12. In a machine of the pantograph type for proportionately duplicatingthe outline of a master model comprising means for supporting a mastermodel in such position that by causing the tracer of the pantographmechanism to follow a predetermined section of the outline of the modelthe scriber of the pantograph mechanism will produce an outline of apattern section upon a patternsheet proportional to said section ofthemodel, and means for relatively adjusting the model or ,a patternsheet angularly about a pantographic center with relation to the anormal position thereof, that when the tracer is caused to follow anadjacent section of the outline of the model the scriber will be movedin a path upon the pattern sheet which will vary from that which itwould follow if the model or pattern sheet were in their normal positionbut will merge with the outline produced when the model and patternsheet are in their normal positions without interrupting the continuityof the outline of adjacent sections.

LEROY L. FAUNCE.

